Using ohms law

An easy way to remember ohms law ( the orientation of voltage, current and resistance) is the ohms law triangle.  Below is what the triangle looks like:

V=Voltage, I=Current, R=Resistance

Just remember V over I equals R.
This triangle can help you remember ohms law and make it easier to calculate each value.
Ohms law states the potential difference (voltage) across a conductor is proportional to the current flowing through the conductor.
To calculate ohms law in a circuit with the triangle, you would cover the variable that you want to find and input the other 2 variable and calculate, either multiply or divide. You divide the numbers when one is on top of the other like V/I or V/R. You multiply when the numbers are beside each other like I*R.

For example:
To calculate R, you'd cover R and you'd have V/I, so input the voltage and current from the circuit and divide to get the resistance.
To Calculate I, you'd cover I  and you'd have V/R, so you input  the voltage and current from the circuit and divide voltage by current.
To calculate V, you'd cover V and you'd have I*R, so you input the current and resistance from the circuit and multiply current (I) by resistance (R).